Revise the knowledge!

123456789
Across
  1. 3. Riding a bike
  2. 7. A warm bag you sleep in, especially outdoors
  3. 8. Swimming underwater with a mask to see fish and plants.
  4. 9. A big area full of trees and animals
Down
  1. 1. A mountain that can explode with hot lava
  2. 2. Staying in a tent outdoors for fun
  3. 4. a book, you use it when traveling
  4. 5. Land with water all around it.
  5. 6. bored When you feel there’s nothing interesting to do.